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Social mating systems describe the socio-spatial relationship between members of the opposite sex for the purpose of reproduction Reichard The study of social mating systems requires time and effort.
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To adequately char- acterize a population, broken bodies: migrant farmworkers in the united states. is essential to work with a color-banded population, where territories are mapped carefully, all breeding nests are found and parental care P. Reboreda et al. In addition, the description of social mating systems is often considered uninteresting or of limited regional relevance. The study of mating systems in Neotropical passerines has lagged behind when compared to the Nearctic and Palearctic passerines, and today remains undescribed for most species.
North of the Neotropic, the Nearctic region, with a predominantly temperate climate, extends to the Arctic Newton The Nearctic and the Neotropic differ in several abiotic and biotic features that can have profound implications for avian social mating systems. Several hypotheses predict greater parental investment per young in the Neotropics e.
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Due to the differences in ecological factors, demography, and life-history strategies, comparisons between hemispheres can shed new light on our understanding of the evolution and mainte- nance of extant social mating systems. Lack noted that although wrens Troglodytidae are mostly distributed in the Neotropics, social polygyny only occurs in the Nearctic wren species. Wrens include approximately 85 species, nine of which inhabit North America Brewer ; Kroodsma and Brewer Cistothorus and Troglodytes are closely related taxa Barkerdespite inhabiting different environments grasslands vs.
Here we present a comparative study of the social mating system and parental care patterns of north and south temperate Sedge Wrens and House Wrens. With this objective we compared social polygyny rates, male contribution to feeding nestlings, and clutch size between south temperate and north temperate populations.
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This is the first step towards a broad description of the geographical variation patterns in social mating systems; thus, we hope to provide data for future comparative analyses as well as to stimulate much needed researches on mating systems of Neotropical birds. Table 1.
Sedge Wrens and House Wrens are broadly distributed from southern Canada to Tierra del Fuego and inhabit tropical and temperate environments in both hemispheres Brewer ; Kroodsma and Brewer ; Fig.]
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